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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.